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docs: features/dns-cache: clean up

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Matthias Schiffer 2017-06-07 17:07:52 +02:00
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docs/features/dns-cache.rst
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@ -1,9 +1,10 @@
DNS-Caching DNS caching
=========== ===========
User experience may be greatly improved when dns is accelerated. Also, it User experience may be greatly improved when dns is accelerated. Also, it
seems like a good idea to keep the number of packages being exchanged seems like a good idea to keep the number of packages being exchanged
between node and gateway as small as possible. In order to do this, a between node and gateway as small as possible. In order to do this, a
dns-cache may be used on a node. The dnsmasq instance listening on port DNS cache may be used on a node. The dnsmasq instance listening on port
53 on the node will be reconfigured to answer requests, use a list of 53 on the node will be reconfigured to answer requests, use a list of
upstream servers and a specific cache size if the options listed below are upstream servers and a specific cache size if the options listed below are
added to site.conf. Upstream servers are the DNS servers which are normally added to site.conf. Upstream servers are the DNS servers which are normally
@ -15,11 +16,11 @@ There are the following settings:
If both options are set the node will cache as much DNS records as set with If both options are set the node will cache as much DNS records as set with
'cacheentries' in RAM. The 'servers' list will be used to resolve the received 'cacheentries' in RAM. The 'servers' list will be used to resolve the received
DNS-queries if the request cannot be answered from cache. DNS queries if the request cannot be answered from cache.
If these settings do not exist, the cache is not intialized and RAM-usage will not increase. If these settings do not exist, the cache is not intialized and RAM usage will not increase.
When next_node.name is set, an A-record and an AAAA-record for the When next_node.name is set, an A record and an AAAA record for the
next-node-IP are placed in the dnsmasq configuration. This means that the content next-node IP address are placed in the dnsmasq configuration. This means that the content
of next_node.name may be resolved even without upstream connectivity. of next_node.name may be resolved even without upstream connectivity.
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